Diastereocontrol in the opening of vic-acceptor-donor cyclopropanes. Application to the synthesis of (cis) 1-EWG-2-hydroxymethylcyclopropanes
摘要:
Basic intramolecular ring opening reactions of vicinally substituted acceptor-donnor (trans)-cyclopropanes were studied. An application to the diastereoselective synthesis of (cis)-1-EWG-2-hydroxymethylcyclopropanes is presented.
A simple one-pot preparation of (Z)-cyclopropanes from γ,δ-ketoalkenes using KOH/DMSO intramolecular alkylation conditions.
摘要:
Sequential treatment of gamma,delta-ketoalkenes with aqueous NBS in DMSO and KOH as solid provides (Z)-cyclopropanes in good overall yields with a diastereoselective excess >99%.